KH-4 18 [USAF]
The KH-4 (Keyhole-4) was fourth version in the Corona-program to build an optical reconnaissance satellite. Only the first two satellites were launched under the name Discoverer, before this designation was dropped.
The KH-4 payload introduced a second camera to provide stereoscopic imaging. The Corona-M or Mural camera consisted of two C''' (Corona triple-prime) cameras inherited from KH-3. The cameras were mounted with 30 degrees separation angle. The two cameras are referred to as fore (for forward looking) and aft (for rear looking). KH-4 also carried a 4 cm index camera, with a focal length of 38 mm, a ground resolution of 162 m, and frame coverage of 308 km × 308 km. The Film was returned by a single General Electric return vehicle (SRV, Satellite Return Vehicle). The Mural-camera was built by Itek Corporation and had a ground resolution of 7.5 m.
The satellite was based on the Agena-D upper stage, which provided attitude control in orbit. The film return capsule carried its own small solid-fuel retro motor to deorbit at the end of the mission with mid-air recovery of the returning capsule by a specially equipped aircraft.
Earlier KH-4 missions were based on the Agena-B stage.
Some missions featured piggy-back payloads, which remained connected to the Agena-D stage
Two missions carried small satellites into orbit.
|Type / Application:||Reconnaissance, photo (film return type)|
|Equipment:||Mural-camera, index camera|
|Configuration:||Agena-D, 1 SRV|
|Propulsion:||Bell 8096, Star-12 retro motor|
|Mass:||~1200 kg (incl. Agena stage)|
|KH-4 7 (Corona 45)||28.06.1962||Va 75-1-1||Thor-DM21 Agena-D|
|KH-4 10 (Corona 48)||02.08.1962||Va 75-1-1||Thor-DM21 Agena-D|
|KH-4 11 & RM 3 (Corona 49)||29.08.1962||Va 75-1-2||Thor-DM21 Agena-D|
|KH-4 13 & RM 4 (Corona 52)||29.09.1962||Va 75-1-2||Thor-DM21 Agena-D|
|KH-4 16 (Corona 57)||04.12.1962||Va 75-1-2||Thor-DM21 Agena-D|
|KH-4 17 (Corona 58)||14.12.1962||Va 75-3-5||Thor-DM21 Agena-D|
|KH-4 18 (Corona 59, OTV 0048, FTV 1157)||07.01.1963||Va 75-1-1||Thor-DM21 Agena-D|
|KH-4 19 (Corona 60, OPS 0583)||28.02.1963||Va 75-3-5||F||Thor-SLV2A Agena-D|
|KH-4 20 (Corona 62, OPS 0720, FTV 1660)||01.04.1963||Va 75-3-5||Thor-DM21 Agena-D|
|KH-4 21 (Corona 65, OPS 0954)||12.06.1963||Va 75-3-4||Thor-SLV2A Agena-D|
|KH-4 22 (Corona 66, OPS 0999)||27.06.1963||Va 75-1-2||Thor-SLV2A Agena-D||with Hitchhiker 1|
|KH-4 23 (Corona 67, OPS 1266)||19.07.1963||Va 75-1-1||Thor-DM21 Agena-D|
|KH-4 24 & RM 5 (Corona 73, OPS 2268)||09.11.1963||Va 75-1-2||F||Thor-DM21 Agena-D|
|KH-4 25 (Corona 74, OPS 2260)||27.11.1963||Va LC-1-1||Thor-DM21 Agena-D|
|KH-4 26 (Corona 75, OPS 1388)||21.12.1963||Va 75-1-2||Thor-SLV2A Agena-D||with P-11 4101|
Further KH missions:
Further Corona missions: